The strat I am planning to try is to burn as many snacks as possible until the Spriggan, then kill it and break her bar. After that, I kill more snacks in order to get her to eat the eyeball that gives full heal before her HP loss kicks in, and then just stall until she kills herself.
The main issues I see are that the Spriggan has a ton of HP, and thus will likely need an NP from a DPS with MLB GM, but that DPS is going to have 1 HP for the rest of the battle, so they kind of have to be sacrificial. However, if you don’t kill the Spriggan, MHX gets buff removal on attack, which will ruin any form of taunt/hard defense strategy, so it’s kind of a necessary evil.
The other reason to break her bar before you finish all the snacks is that it will cost her actions. Once you break her bar, she’ll have a permanent +100% attack and +50% crit rate, so she WILL one-shot you with crits, even if you defense stack. That means healing is probably not going to cut it, and reducing her actions/turn will be a huge benefit. To that end, there are those snacks that inflict a stun and charm to her, which will be much more valuable after break.